"A fire will never burn there."
Translation:Dort wird nie ein Feuer brennen.
Can we get rid of the multiple choice sentences?
No. We are just learners. We have no influence about which kinds of exercises are chosen.
You would have to talk to Duolingo directly, but I don't think they're set up for direct input from learners -- nor would they consider it.
Instead, they go by numbers -- they test certain changes in an A/B fashion (one group gets the new behaviour, another control group keeps the old behaviour) and then they see whether certain key performance indicators go up or down. Then they choose a mix of exercises that make the numbers look best.
Unfortunately for serious learners, I don't think "productive" or "effective" rank very highly in those numbers -- things such as "learner retention" seem more important, so they go tend to have lots of easy exercises that won't scare casual learners away even if serious learners start yawning.